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<p>Due to the low carrier mobility and surface trap states, the performance of bismuth vanadate (BiVO<sub>4</sub>) photoanodes in solar-driven water splitting is significantly lower than theoretical predictions. In this study, a Bi-rich/BiVO<sub>4</sub> Schottky junction (hereafter referred to as BVO/Bi) was fabricated <i>via</i> a self-reduction method. This approach not only enhances the transfer of photogenerated charges to the photocathode but also effectively passivates the electron-hole recombination centers on the photoanode surface. Under Air Mass 1.5 Global (AM1.5G) simulated solar illumination, the photocurrent density of BVO/Bi at 1.23 V <i>versus</i> the reversible hydrogen electrode (RHE) reached 2.6 mA/cm<sup>2</sup>, approximately twice that of pristine BiVO<sub>4</sub> (1.3 mA/cm<sup>2</sup>). Furthermore, after incorporating nickel iron oxide (NiFeOOH) as a co-catalyst, the hydrogen production efficiency of BVO/Bi increased to 83.4 µmol·h<sup>−1</sup>·cm<sup>−2</sup>. This work highlights that simple self-reduction can effectively modulate the surface characteristics and charge transfer kinetics of BiVO<sub>4</sub> photoanodes, offering a promising strategy for advancing more cost-effective and efficient solar water splitting technologies.</p>

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Self-reducing Bi in BiVO4 Photoanode Enhancing Photochemical Water Splitting Performance

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Longyue Yang,
  • Chen Guan,
  • Quanjun Xiang

摘要

Due to the low carrier mobility and surface trap states, the performance of bismuth vanadate (BiVO4) photoanodes in solar-driven water splitting is significantly lower than theoretical predictions. In this study, a Bi-rich/BiVO4 Schottky junction (hereafter referred to as BVO/Bi) was fabricated via a self-reduction method. This approach not only enhances the transfer of photogenerated charges to the photocathode but also effectively passivates the electron-hole recombination centers on the photoanode surface. Under Air Mass 1.5 Global (AM1.5G) simulated solar illumination, the photocurrent density of BVO/Bi at 1.23 V versus the reversible hydrogen electrode (RHE) reached 2.6 mA/cm2, approximately twice that of pristine BiVO4 (1.3 mA/cm2). Furthermore, after incorporating nickel iron oxide (NiFeOOH) as a co-catalyst, the hydrogen production efficiency of BVO/Bi increased to 83.4 µmol·h−1·cm−2. This work highlights that simple self-reduction can effectively modulate the surface characteristics and charge transfer kinetics of BiVO4 photoanodes, offering a promising strategy for advancing more cost-effective and efficient solar water splitting technologies.